Well-casing spear.



S. A. GUIBERSON, Jn.

I WELL CASING SPEAR.

APPLICATION IILBD D110. 16, 1913.

1,099,358, Patented June 9, 191i 2 SHEETS-SHEET I.

WITNESSES INVENTUR Q4. 52W Jaw! my 401m yr, 3 I ha/9M A TTORIVEY COLUMBIA PLANDORAFM $0.. WASHINGTON. I). c.

S. A. GUIBERSON, Jn. WELL CASING SPEAK.

PPLIOATION FILED DEC. 1a, 1913 Patented June 9, 1914.

2 S BETS SHEET 2.

' win/5885s.-

Arm/mix mere.

SAMUELALLEN GUIBERSON, JR, OF SAN FRANCISCO, CALIFORNIA.

WELL-CASING- SPEAK.

To all whom it may concern Be it known that I, SAMUEL ALLEN GUnnansoN, Jr., a citizen of the United States, residing in the city and county of San Francisco and State of California, have invented certain new and useful Improvements in lVell-Casing Spears, of which the following is a specification.

My invention relates, in general, to that class of well-casing spears in which an an nular series of gripper-slips are fitted to tapered seats in a stock, whereby in running down in the casing said series of slips contract in circumference sufliciently to pass down freely, but expand in circumference on the lifting movement, so that the slips grip the casing.

My invention relates, in particular, to a species of this type of spear above mentioned, which embodies a loosehead ring and a loose foot-ring slidably mounted on the stock respectively above and below the gripper-slips, said rings coacting with cross keys fitted through the mandrel of the stock, 7 and an operating spring seated around the stock between the head of its body portion and the loose head ring, said spear further embodying a mandrel-trip and a safety latch, all as illustrated, described and claimed in that certain application now pending for a patent by one Smith Vroman, filed October 4, 1913, under Serial Number 793366, and to which reference is hereby expressly made, as I do not claim herein as my invention anything claimed or which can be claimed in said 7 application.

My invention consists in the novel means,

which I shall hereinafter fully describe for holding the mandrel set while the spear is running in the hole, trippingit for its work, and safely locking it against resetting while rising in the hole.

The object of my invention is to provide means for these purposes, which do not involve any notching of the mandrel, which notching has a tendency to weaken it.

Referring to v the accompanying drawingsFigure 1 is an elevation of the spear.

Fig. 2 is a vertical longitudinal section ofthe same. Fig. 3 1s a fragmentary eleva- Specification of Letters Patent.

Application filed December 16, 1913.

Patented June 9, 1914.

Serial No. 806,954.

body portion at of the stock are formed the tapered grippe1--slip-seats 5 which deepen from the bottom upwardly. To these seats are fitted thegripper-slips 6, by a freely jslidabl'e connection, such as is afforded by the groove 7 in the seat and the tongue 8 t on the back of the slip. \V hen the slips rise to their upper limit they have the same circumference as the stock body, but when and as they move down they project beyond said. circumference. Teeth 9 are shown on the faces of the slips to cause them to grip.

About the upper portion of the stock is fitted slidably the loose head ring 10 which is formed on its upper face with an annular recess 11. A cross key 12 lies in the recess 11 and said key traverses and is freely slid- ,able up and down in an elongated key-slot 13 in the stock. The key 12 is fitted through the mandrel 3. Around the stock 1, between the lower face of the head ring 10 and the top of the body portion 1 of the stock is a spring 14. Freely slidable on the lower portion of the stock, below the slip-seats 5, is the loose foot ring 15, the lower face of which is formed with an annular recess 16, in which lies a cross'key 17 which is fitted through the mandrel 3 and has free play in an elongated key-slot 18 in the stock.

19 is a foot nut on the stock.

20 is a handled tool to be screwed into the lower end of the mandrel, and 21 is a handled setting nut threaded on the setting tool 20 and adapted to bear against the foot of the stock.

The spear, as thus far described, is the same as that disclosed in the Vroman application above referred to. To set said spear the operation has been to pull down the mandrel 3 by means of the setting tool 20 and setting nut 21, whereby through the upper cross key 12 and the loose head ring 10 the spring 14 is compressed, and at the same time the lower cross key 17 is moved down to allow the loose foot ring 15 to drop down, and free the gripper-clips 6, so that they can slide on their seats. This movement of the mandrel in the spear referred to is sufficient to bring into play a trigger pin mounted in the side of the stock and adapted to engage a notch in the mandrel, so that when the setting tool 20 and nut 21. are released, the pressure of the spring 14.- is sufficient to hold the engagement. of the trigger pin with the mandrel notch. Thus the spear is set and can run in the hole, the slips 6 freely rising to their smaller circumference.

When the. spear reaches its point of work, the lifting movement begins, and the slips 6 move down expanding their circumference to grip the casing. As they take hold of the casing they immediately cause the mandrel to move. down still farther slightly, through their pressure on the loose foot ring 15 and the lower cross key 17 and this slight downward movement of the mandrel is sufficient to release the engagement of the trigger-pin, whereupon the'spring 14, acting.

through the head ring 10 and cross key 12 throws the mandrel up again to call into action a safety-latch mounted in the side of the stock and adapted to engage another notch in the mandrel, so that the mandrel is locked against resetting while the spear is being pulled out.

It will be noted that in the spear as thus described, the setting, tripping and safetylocking are effected by devices engaging notches in the mandrel. My invention, as I have above stated, has to do solely with improved setting, tripping and safety locking devices of this spear, and these are of such a character as to avoid any notching and consequent weakening of the mandrel, which in this class of tools is of great importance. My improvements will now be described. The lower face of the loose head ring 10 is cut out or recessed at 22 for a portion of its circumference to form a shoulder 23. Into this recess and against this shoulder is fitted the upper end of the spring 14-. The upper face of the body portion 4 of the stock is also recessed at 2 1 for a portion of its circumference to form a shoulder 25, and in this recess and against this shoulder the lower end of the spring 14 is fitted. It will now be seen that if the loose head ring 10 be turned on its axis, the spring 14 will be subjected to a twisting strain. Now, in order to hold the spring under this strain and to connect rotatively the head ring and the cross key, the upper edge of the said loose head ring 10 is formed with ratchet teeth 26, and the ends 27 of the upper cross-key 12 are carried out as pawls' to engage said ratchet teeth. The elongated slot 13 in the stock, in which the upper crosskey plays, is, from its upper end clownwardly chambered out at 28 on opposite substantially radial lines, to the point at which the mandrel is to be locked against resetting, and said slot 13 on its opposite sides is similarly chambered out at 29 from its bottom upward so that the floor stop of the chamhers 28 and the roof stop of the cham- 18 of the stock, as shown in Fig. 7,. are

chambered out on each side, which chambers may be like those of the upper slot if additional contemporaneous similar action be desired for increased certainty, or they may be, as here shown, simple chambers 32, so that the lower crosskey 17 may have side play to permit the mandrel to turn.

The operation is as follows :To set'the spear, the mandrel 3 is drawn down by means of the setting tool 20 and nut21. The

upper cross-key '12 passes down in the slot 13, until its upper edge reaches the level of the beveled roof stop 30 of the lower chambers 29 of said slot, and thereupon a suitable span ner being applied to the loose head-ring 10, said ring is turned on its axis. This turning has the immediate and primary effect,

due to the spring pressure with which the ring and the cross key are held in contact, of carrying the beveled top 31 ofthe cross key under said beveled roof stop 30, and

then has the further and secondary eifect when the cross key is'stopped in said chambers of placing a twisting strain on the spring 1 1, due to the continued'turningof the ring, and said twisting strain 'ismaintained by the pawl ends27 of thecross-key engaging the ratchet teeth 26 ofthering Now, when the settingtool 20 and nut 21 are released, the expansion pressure of the spring 14 will hold the cross key 12 up against the roof stop of the chambers '29 with suiiicient forceto prevent the twisting.

strain of the spring fromdisengaging it, and thus the spear is set and can be run in the hole. Then the point is reached for the spear to take hold of the casing, the lifting movement begins and immediately the grip per-slips move downand expand to their work. As. soon-as they grip the casing the first effect of the lifting strain is to cause them to bear down on the foot ring 15 and through said ring and its cross-key 17 to f orce the mandrel down slightly,..but sufficiently to relieve the binding pressure of the upper cross-key 12 under the roof stop of the chambers 29. This continues as long as the lifting strain is imposed on the spear, but

when the work of the spear at that point is completed, then in order to release its grip the stock is jarred down, with the effect of relieving the mandrel from the pulling down force, whereupon the twist of the spring 14 will return the cross key 12 into the slot 13,

andby its expansion the spring will lift it and move it over still farther into the upper chambers 29, and hold it there, so that said key will now engage the floor stop of said chambers and prevent the mandrel from being drawn down again to reset itself while the spear is being pulled out.

I claim 1. In a well-casing spear, the combination of a stock having a body portion with upwardly tapered seats, a central bore, and elongated slots traversing said bore above and below the body portion, the upper slot having side stops; a mandrel longitudinally slidable in the bore of the stock; an upper and a lower cross-key carried by the mandrel and playing in the slots of the stock; a loose head-ring slidably fitted upon the stock and arranged to bear up under and engage the upper cross key; a spring around the stock between its body portion and the loose headring to hold the ring to the key, said spring having its ends shouldered against the head ring and the body portion of the stock, whereby it is adapted for twisting strain under the turning of the head ring on its axis, to eflect the engagement of the upper cross-key with the side stops of the upper slot and its release therefrom; a loose foot ring slidably fitted upon the stock below its tapered seats and arranged to bear down upon the lower cross-key; and gripper slips slidably fitted to the tapered seats of the stock above the loose foot-ring. V

2. In a well-casing spear, the combination of a stock having a body portion with upwardly tapered seats, a central bore, and elongated slots traversing said bore above and below the body portion, the upper slot having side chambers on corresponding opposite radii opening downward and terminating in a floor stop and having also other side chambers on corresponding opposite radii opposed to the first chambers and opening from below upwardly to a roof stop; a mandrel longitudinally slidable in the bore of the stock; an upper and a lower cross key carried by the mandrel and playing in the slots of the stock; a loose head-ring slidably fitted upon the stock and arranged to bear up under and engage the upper cross-key; a spring around the stock between its body portion and the loose head-ring to hold the ring to the key, said spring having its ends shouldered against the head ring and the body portion of the stock, whereby it is adapted for twisting strain under the turning of the head ring on its axis, to effect the engagement of the upper cross-key under the roof stops of the lower chambers of the slot in which it plays, and its release therefrom, and to effectthe engagement of said key with the floor stops of the upper chambers of said slot; a loose toot-ring slidably fitted upon the stock below its tapered seats and arranged to bear down upon the lower cross-key; and gripper slips slidably fitted to the tapered seats of the stock above the loose foot-ring.

3. In a well-casing spear, the combination of a stock having a body portion with up wardly tapered seats, a central bore, and elongated slots traversing said bore above and below the body portion, the upper slot having side chambers on corresponding opposite radii opening downward and terminating in a floor stop and having also other,

side chambers on corresponding opposite radii opposed to the first chambers and open ing from below upwardly to a roof stop; a mandrel longitudinally slidable in the bore of the stock; an upper and a lower cross key carried by the mandrel and playing in the slots of the stock; a loose head-ring slidably fitted upon the stock and arranged to bear up under and engage the upper cross-key; a pawl and ratchet connection between said upper cross-key and said loose head-ring; a spring around the stock between its body portion and the loose head-ring to hold the ring to the key, said spring having its ends shouldered against the head-ring and the body portion of the stock, whereby it is adapted for twisting strain under the turning of the head ring on its axis, to effect the engagement of the upper cross-key under the roof stops of the lower chambers of the slot in which it plays, and its release therefrom, and to effect the engagement of said key with the floor stops of the upper chambers of said slot; a loose foot-ring slidably fitted upon the stock below its tapered seats and arranged to bear down upon the lower crosskey; and gripper slips slidably fitted to the tapered seats of the stock above the loose foot-ring.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

SAMUEL ALLEN GUIBERSON, JR-

Witnesses:

WM. F. BoorH, D. B. RICHARDS.

Copies of this patent may be obtained. for five cents each, by addressing the Commissioner of Patents, Washington, D. 0. 

